Filtering apparatus



Feb. 9, 1926. 1,572,076

'- w. PATERSON FILTERING APPARATUS Filed Feb. 4, 1925 3.Sheets-Sheet 1 Feb. 9 1926.

W. PATERSON FILTERING APPARATUS 3 Sheets-Shet 2 Filed Feb. 4, 1925 Figgi.

Feb. 9

w. PATERSON FILTERING AIfPARA'I 'US Filed Feb. 4

1925 3 Sheets-Sheet a Patented Feb. 9, 1926.

UNITED STATES WILLIAM PATIERSON, OF LONDON, ENGLAND.

FILTERING APPARATUS.

Application filed February 4, 1925. Serial No. 6,883.

To all wizum it may concern.

Be it known that 1, lVILLrAM PArEinsoN,

' a subject of the King ofGreat Britain and Ireland, and residing at Windsor House, Iungsway, London, C. 2, Englal'id, have invented certain new and useful I1nprove= i 'ne'nts Filtering Apparatus (for which have hled an application in Great Britain, la 0. 2,382, dated January 29, 1924), of which the followii'ig is a specification.

ihis invention relates to filtering appara tus with more particular reference to what are known as rapid filters which are pro-' v ded with under-drains or collecting and distributing systems for collecting the fil- I tore-Cl water and for distributing the washwater employed for cleansing the filter bed.

In both the collecting and distributing Operations it is essential that the water should be drawn off and applied duringthe washing process at as uniform a rate as p ssible throughout the whole area of the filter bed While the system must beof such character as to withstand the fairly considerahle pressure under which the washwater is applied at the point of entry. For this pu pose the strainer system usually consists of more or less elaborate metallic pipe constructions connected to distributing and collecting men' bers sometimes furnished with spray or discharge nozzles set at uni- 7 form intervals.

The object of the present invention is to effect improvements in the collecting and distributing systems of filtering apparatus which will render the same clean and hyf 'ienic, not subject to'deterioration or corrosion and at the same time capable of giving a much more uniform collection of thefiltered water and distribution of the washwater than is obtainable with the systems hitherto adopted;

The invention consists in filtering plant or apparatus provided with a collecting and distributing system comprising a series of channels in the concrete or other foundation of the filter serving as distributing or collecting headers and hollow tiles, tubes or like collecting and distributing members :ceinented or otherwise seclu'ed in said channels and having restricted openings in their under sides for establishing communication with the main channels and perforated upon their upper and outer :surfaces for securing an even distribution .over the whole area of The invention also consists in other details and arrangements hereinafter described or indicated.

The accon'ipanying d "awings. illustrate several modes of carrying out the invention.

Figure l is a part sectional elevation of a portion of apparatu in accordance with the invention, and

Figures 2 and 3 are sections on the lines 2 2 and 33 respectively.

Figures i and 5 are two views showing a modification, and

Figure 6 shows a further modification, while,

Figure Figure 6.

In carrying my invention into effect in one convenient manner I may form the bed or foundation a forthefilter plant from concrete, ferro-concrete or the like and in such concrete or like. foundation I provide one or more main channels 2) and with side branch channels 0 leading into same. These side branch channels are preferably as numerous as is convenient .in order to ensure the maximum uniformity of distribution and extend across the filter bed. Each of such channels is rebated or recessed or otherwise suitably formed to take the hollow tiles d, tubes or the like or a series of such members, the membersbeing secured-1n position by cementing or otherwise or being anchored by suitable means, or being secured in any other convenient manner such that they may withstand the pressure at which the washwateris applied to the points of entry. Un

der the under side of each tile or like'memher; which is formed of fi-reclay, porcelain, cement or other suitable material, I provide a series of relatively small or restricted apertures serving to allow. of'the egress of filtered water from the members into the channels during the collecting operation or the ingress of waslrwater from the channels into the members during the distributing operation. Each of such til es or like mem hers is preferably made curved upon its upper and outer surfaces and such surfaces are perforated with a relatively large number of small apertures e and by this means I am enabled to secure a very uniform distribution of wash-water while at the same time the whole construction is such that the un der-drain system is clean and hygienic and is not liable to deterioration.

The main collecting channel 6 may be is a; section on the line 777 of covered by slabs f of concrete or similar material which are: so formed and spaced as to permit of the continuance of the line of distributing hollow tiles just referred to right across the space toj oint up with those, in the side branch channels on the other side of the main channel and so form acon tinuous line the full width of the tank.

It will be understood that the invention is not to be confined to any. particular material from which thetiles or like members are formed nor to any particular shape, formation or method of securing of such members.

When a series of members are employed for one channel such may be jointed by ordinaryspigot oints .or by means of intercon ncct-ing plugs or by other suitable means, care being taken that the joints are such that they will be rendered fluid-tight even under the pressure at which the Wash-Water is ap plied; Each tile may be sealed at one end so as to have a spigot formation and open at the other end so as to form a faucet so that when these tiles are joined up. in line they are sealed atboth ends so that the distribution of the wash-water. effected by there stricted orifices on the under side is confined to the"length of the tile. and so; uniformity of distribution is effected. f I

' Each tile or like member may be formed as an integral whole or it may be made in two or more parts as, for example,.tlle plain bottom portion may be in one piece while the upper curved portion may be in another piece, and in any modification of the invention stirrups or other means may be adopted; for anchoring the tubular or like members in position upon the channels;

The channels in the filter bottom or foundation may be combined with the tile members, as shown in Figures (Sand 7, where the tile members (1" consist of perforated 'tlat slabs laid across the channels, as shown, the slabs (Z with the restricted orifices therein forming'thelower parts of such tile memt may be desirable to arrange the system as described to be utilized for the uniform distribution of air aswellas waslrivater. I may effect this uniform distribution of'air by constructing the restricted discharge orifices with extended shanks g, it so that they may be sealed by the water in the channel underneath'. lViththisconstruction when the air is turned on into the main channel and side branch channels it will depress the water which is free to escape through the submerged orifices, one ortwosmall perforationsi on the under side of the tiles or it at the root of the extended shank permitting a small escape of air in the initial stages of the process of applying the airand permitting the complete venting of the system from air and so avoiding the formation of air pockets when the wash-water is applied later. Moreover, in any inodiiicat ion the shank members 71 may be slotted for a part of their length, as shown at It.

I may prefer to have the bulk of the perfo- 'ati'ons in the hollow tiles arranged on either side, as shown at a, with one or two perfo z tions 6 (Figures i and 5) on the top surface so that when the applied air has reached the inside of the hollow tile it has to depress the water underneath before escaping uniformly through the side perforations. yHere, again, one or two perforations on the top of the tile will prevent the formation of air pockets. I 7

Having now described my iirvention, what I claim as new and desire to secure by LettersPatent is 1. A filtering apparatus provided with a collecting and distrilaitiur; system cou'ij'irisi a series of channels ing a founda liF-J' therein consti ing headers, said unilation also having a main channel con uuunicating with the cilannels of the series, collecting and I ibutingg; mcn' ers secured in said channels i ing restricted openings in their under sides for establisl'iing communication with the channels and perforated upon their upper and outer si'irfaces for securing an even distribution over the whole area of the filter bed.

2. A filtering apparatus provided with a collecting and distributing system comprising a foundation having a series of channels therein constituting distributing and collecting headers, said foundation also having a main channel communicatin with the channels of the series, collecting-and distributing men bers secured in said channels having restricted openings in their under sides for cstablishing communication with the channels WILLI iJ rarisnson.

.ii uistributing and collect- 

